Archived posting to the Leica Users Group, 2000/04/08

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Subject: RE: [Leica] Analog vs. digital (long and barely OT)
From: Austin Franklin <austin@darkroom.com>
Date: Sat, 8 Apr 2000 22:21:24 -0400

> A 4 inch X 5 inch image will require
> 4X300=1200 pixels by 5X300=1500 pixels. Measured in pixels you'll want a
> 1200X1500 pixel image. For black & white you'll need 1,800,000 pixels or
> as commonly expressed, 1.8 mb.

Black and white has gray scale, and you still need some number of bits per 
pixel (if you are talking about pixels), unless you want a monotone image.

[correction] I stated this slightly wrong...what was meant was number of 
pixels does not mean the same as number of M bytes, unless you are talking 
about 8 bit pixels.  For B&W, that would be 256 gray tones...if that is 
sufficient for you, then, yes, a 1.8M pixel would be 1.8M bytes...  If you 
wanted 12 bits/pixel then it would 2.7M bytes, and give you 4096 gray 
tones....